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Frank grab the dupe head with 2 hands and shake back and forth. This will give you an idea what adjusters need tightning. loosen lock nuts and snug allen screws on either the front or back. Back off allen screws slightly. Turn levers till it moves smooth. Snug nuts and rotate to both ends. Some units feel fine to left but tight to right. Being the left side groove has more wear. Mine do. Also clean and lube V track. I use W-40. Also the nylon bushing may need replacing if worn badly.
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